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Effects of Ni doping on the structural, photoelectric, and antibacterial properties of ZnCo2O4 thin films

  • Original Paper: Sol-gel and hybrid materials for optical, photonic and optoelectronic applications
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Abstract

This study addresses improving the electrical properties and demonstrating the antibacterial capability of spinel ZnCo2O4 films. We used sol–gel and spin-coating techniques to prepare samples and analyzed their crystal structures, microstructures, as well as their photoelectric and antibacterial properties, in relation to Ni doping. Single-phase spinel oxide is maintained in all of the Zn(Co1-xNix)2O4 films. The replacement of cobalt by nickel causes a decrease in the average grain size and surface roughness. Both the grain size and the surface roughness affect the optical properties of the film translucence. The transmittances of all films at a wavelength of 600 nm is ~31.3–48.6%. The characteristic absorption peak of the photon-excited electron is about 400 nm. A higher doping content ratio (Nix = 0.15–0.30) causes the absorption characteristic peak to gradually disappear. The direct energy gap of all spinel oxides ranges from 2.45 to 2.57 eV. All films are p-type semiconductors, and nickel can replace cobalt to increase the carrier concentration, resulting in a decrease in the resistivity of Zn(Co1-xNix)2O4 from 312.5 Ω-cm (Nix = 0) to 15.8 Ω-cm (Nix = 0.30). The antibacterial rate for Escherichia coli and Staphylococcus aureus associated of the material can reach more than 99.9%, and no photocatalysis is necessary. Therefore, Ni-doped ZnCo2O4 possesses excellent properties for potential applications.

Highlights

  • Ni is doped in the ZnCo2O4 and influences the material characteristics.

  • Ni doping causes a decrease in the average grain size and surface roughness.

  • Ni replaces Co which enhances hole carrier concentration and conductivity.

  • A point defect mechanism formed of hole carrier of ZnCo2O4 is proposed.

  • ZnCo2O4 resist Escherichia coli and Staphylococcus aureus without photocatalysis.

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Acknowledgements

We thank the China Medical University Hospital and China Medical University for financial support for this research under contract no. ASIA-107-CMUH-10.

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Authors and Affiliations

  1. School of Medicine, China Medical University Hospital and Children Hospital, China Medical University, Taichung, 40402, Taiwan

    Kao-Pin Hwang

  2. Department of Neonatology, China Medical University Children’s Hospital, Taichung, Taiwan

    Hung-Chih Lin

  3. Asia University Hospital, Asia University, Taichung, Taiwan

    Hung-Chih Lin

  4. Department of Computer Science and Information Engineering, Asia University, 500 Lioufeng Rd., Wufeng, Taichung, 41354, Taiwan

    Yu-Zhan Su, Wan-Ping Wu & Ruei-Sung Yu

  5. Department of Medical Research, China Medical University Hospital, China Medical University, Taichung, 40402, Taiwan

    Ruei-Sung Yu

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  1. Kao-Pin Hwang
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Correspondence to Ruei-Sung Yu.

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Hwang, KP., Lin, HC., Su, YZ. et al. Effects of Ni doping on the structural, photoelectric, and antibacterial properties of ZnCo2O4 thin films. J Sol-Gel Sci Technol 97, 441–451 (2021). https://doi.org/10.1007/s10971-020-05406-9

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  • DOI: https://doi.org/10.1007/s10971-020-05406-9

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